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NB12MC0331JBA Equivalent & Substitute Parts
Part Overview
The NB12MC0331JBA is an NTC thermistor manufactured by KYOCERA AVX with a nominal resistance of 330 ohms at 25°C and a B25/85 value of 3910K. This surface mount component in 0805 (2012 Metric) package is designed for temperature sensing applications across the -55°C to 150°C operating range. The part is currently active in production and ROHS3 compliant.
Substitute parts become necessary when the primary part experiences supply constraints, extended lead times, or when design flexibility permits selection from alternative manufacturers offering equivalent electrical and mechanical characteristics within the same package form factor.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Resistance @ 25°C | 330 Ω |
| Resistance Tolerance | ±5% |
| B Value Tolerance | ±3% |
| B25/85 | 3910K |
| Operating Temperature Range | -55°C to 150°C |
| Power Dissipation (Max) | 120 mW |
| Package / Case | 0805 (2012 Metric) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility for NTC thermistors is determined by the following criteria:
Primary Substitution Criteria:
- Identical package form factor: 0805 (2012 Metric) surface mount
- Resistance value @ 25°C: 330 Ω nominal
- B-value characteristics: B25/85 range compatible with 3910K specification
- Resistance tolerance: ±5% maximum
- B-value tolerance: ±3% maximum
- Operating temperature range: Must encompass or exceed -55°C to 150°C
- RoHS compliance: ROHS3 compliant
- Moisture sensitivity: MSL 1 or better
Secondary Compatibility Factors:
- Power dissipation rating: Minimum 120 mW
- Electrical characteristics within specified tolerance bands
Based on the provided substitute list, no parts meet all primary substitution criteria for the NB12MC0331JBA. The substitute parts listed (NCP21WB333J03RA, NCP21WB473J03RA, NCP21WF104J03RA, NCP21XM221J03RA, NCP21XM472J03RA, NCP21XQ102J03RA, NCP21XQ471J03RA, NCP21XW153J03RA, NCP21XW222J03RA, NCP21XW223J03RA) represent alternative resistance values and B-value characteristics from Murata Electronics. These parts share the same package form factor and compliance certifications but differ in nominal resistance and thermal characteristics.
Parameter Comparison
| Part Number | Manufacturer | Resistance @ 25°C | B25/85 | Operating Temp Range | Power Max | Package | RoHS Status | Product Status |
|---|---|---|---|---|---|---|---|---|
| NB12MC0331JBA | KYOCERA AVX | 330 Ω | 3910K | -55°C to 150°C | 120 mW | 0805 (2012 Metric) | ROHS3 Compliant | Active |
| NCP21WB333J03RA | Murata Electronics | 33k Ω | 4108K | -40°C to 125°C | 200 mW | 0805 (2012 Metric) | ROHS3 Compliant | Not For New Designs |
| NCP21WB473J03RA | Murata Electronics | 47k Ω | 4108K | -40°C to 125°C | 200 mW | 0805 (2012 Metric) | ROHS3 Compliant | Not For New Designs |
| NCP21WF104J03RA | Murata Electronics | 100k Ω | 4311K | -40°C to 125°C | 200 mW | 0805 (2012 Metric) | ROHS3 Compliant | Not For New Designs |
| NCP21XM221J03RA | Murata Electronics | 220 Ω | 3545K | -40°C to 125°C | 200 mW | 0805 (2012 Metric) | ROHS3 Compliant | Not For New Designs |
| NCP21XM472J03RA | Murata Electronics | 4.7k Ω | 3545K | -40°C to 125°C | 200 mW | 0805 (2012 Metric) | ROHS3 Compliant | Not For New Designs |
| NCP21XQ102J03RA | Murata Electronics | 1k Ω | 3693K | -40°C to 125°C | 200 mW | 0805 (2012 Metric) | ROHS3 Compliant | Not For New Designs |
| NCP21XQ471J03RA | Murata Electronics | 470 Ω | 3693K | -40°C to 125°C | 200 mW | 0805 (2012 Metric) | ROHS3 Compliant | Not For New Designs |
| NCP21XW153J03RA | Murata Electronics | 15k Ω | 3987K | -40°C to 125°C | 200 mW | 0805 (2012 Metric) | ROHS3 Compliant | Not For New Designs |
| NCP21XW222J03RA | Murata Electronics | 2.2k Ω | 3987K | -40°C to 125°C | 200 mW | 0805 (2012 Metric) | ROHS3 Compliant | Not For New Designs |
| NCP21XW223J03RA | Murata Electronics | 22k Ω | 3987K | -40°C to 125°C | 200 mW | 0805 (2012 Metric) | ROHS3 Compliant | Not For New Designs |
Engineering Selection Recommendations
The NB12MC0331JBA is an active production part with ROHS3 compliance and extended operating temperature range (-55°C to 150°C). All listed substitute parts from Murata Electronics carry "Not For New Designs" status, indicating these are legacy or transitional products. The substitute parts operate within a narrower temperature range (-40°C to 125°C) and feature higher power dissipation ratings (200 mW versus 120 mW).
Selection of substitute parts should be driven by application-specific requirements. The NCP21XQ471J03RA (470 Ω) and NCP21XM221J03RA (220 Ω) represent the closest resistance values to the primary part. However, their B25/85 values (3693K and 3545K respectively) deviate from the 3910K specification of the NB12MC0331JBA. The NCP21XW153J03RA (15k Ω) provides a B25/85 value of 3987K, which is nearest to the primary part's thermal characteristic, but at a significantly different resistance value.
All substitute parts maintain ROHS3 compliance and MSL 1 rating, ensuring compatibility with standard surface mount assembly processes. The decision to substitute should account for the narrower operating temperature range and the deviation in both resistance and B-value characteristics from the original specification.
Frequently Asked Questions (FAQ)
Q: Can NCP21XQ471J03RA directly replace NB12MC0331JBA?
A: Both parts share the 0805 (2012 Metric) package form factor and ROHS3 compliance. However, the NCP21XQ471J03RA has a nominal resistance of 470 Ω compared to 330 Ω, and a B25/85 value of 3693K versus 3910K. Direct substitution is not recommended without circuit re-evaluation to confirm thermal response compatibility.
Q: Why do all substitute parts show "Not For New Designs" status?
A: The substitute parts listed are from Murata's NCP21 series and represent legacy product lines. These parts remain available in inventory but are not recommended for new design implementations. The NB12MC0331JBA from KYOCERA AVX maintains active production status.
Q: What is the significance of the B25/85 parameter in thermistor selection?
A: The B25/85 value defines the thermistor's thermal response characteristic, specifically the resistance change between 25°C and 85°C. This parameter is critical for temperature sensing accuracy. Deviations from the specified B-value affect the calibration and linearity of temperature measurement circuits.
Q: Are all substitute parts suitable for the full -55°C to 150°C temperature range?
A: No. All listed substitute parts operate within -40°C to 125°C. Applications requiring the extended -55°C to 150°C range of the NB12MC0331JBA cannot use these substitutes without thermal performance verification.
Q: What packaging formats are available for these thermistors?
A: All parts listed are surface mount components in 0805 (2012 Metric) package. Substitute parts are available in Tape & Reel (TR) or Cut Tape (CT) & Digi-Reel® formats, while the primary part packaging is not specified in the provided data.
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